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Source: — Data Sufficiency |
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by ColumbiaVC » Tue Aug 09, 2011 8:54 pm
A

Given wx=y and xy=?
1) w(x^2)=16
=> wx(x)=16 substitute wx=y
=> y(x)=16
=> xy=16
Sufficent

2) y=4
Don't know the value of x. So, can't find xy value.
Not Sufficient
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